summaryrefslogtreecommitdiffstats
path: root/drivers/clk/meson/gxbb-aoclk-32k.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clk/meson/gxbb-aoclk-32k.c')
-rw-r--r--drivers/clk/meson/gxbb-aoclk-32k.c193
1 files changed, 0 insertions, 193 deletions
diff --git a/drivers/clk/meson/gxbb-aoclk-32k.c b/drivers/clk/meson/gxbb-aoclk-32k.c
deleted file mode 100644
index 680467141a1d..000000000000
--- a/drivers/clk/meson/gxbb-aoclk-32k.c
+++ /dev/null
@@ -1,193 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (c) 2017 BayLibre, SAS.
- * Author: Neil Armstrong <narmstrong@baylibre.com>
- */
-
-#include <linux/clk-provider.h>
-#include <linux/bitfield.h>
-#include <linux/regmap.h>
-#include "gxbb-aoclk.h"
-
-/*
- * The AO Domain embeds a dual/divider to generate a more precise
- * 32,768KHz clock for low-power suspend mode and CEC.
- * ______ ______
- * | | | |
- * ______ | Div1 |-| Cnt1 | ______
- * | | /|______| |______|\ | |
- * Xtal-->| Gate |---| ______ ______ X-X--| Gate |-->
- * |______| | \| | | |/ | |______|
- * | | Div2 |-| Cnt2 | |
- * | |______| |______| |
- * |_______________________|
- *
- * The dividing can be switched to single or dual, with a counter
- * for each divider to set when the switching is done.
- * The entire dividing mechanism can be also bypassed.
- */
-
-#define CLK_CNTL0_N1_MASK GENMASK(11, 0)
-#define CLK_CNTL0_N2_MASK GENMASK(23, 12)
-#define CLK_CNTL0_DUALDIV_EN BIT(28)
-#define CLK_CNTL0_OUT_GATE_EN BIT(30)
-#define CLK_CNTL0_IN_GATE_EN BIT(31)
-
-#define CLK_CNTL1_M1_MASK GENMASK(11, 0)
-#define CLK_CNTL1_M2_MASK GENMASK(23, 12)
-#define CLK_CNTL1_BYPASS_EN BIT(24)
-#define CLK_CNTL1_SELECT_OSC BIT(27)
-
-#define PWR_CNTL_ALT_32K_SEL GENMASK(13, 10)
-
-struct cec_32k_freq_table {
- unsigned long parent_rate;
- unsigned long target_rate;
- bool dualdiv;
- unsigned int n1;
- unsigned int n2;
- unsigned int m1;
- unsigned int m2;
-};
-
-static const struct cec_32k_freq_table aoclk_cec_32k_table[] = {
- [0] = {
- .parent_rate = 24000000,
- .target_rate = 32768,
- .dualdiv = true,
- .n1 = 733,
- .n2 = 732,
- .m1 = 8,
- .m2 = 11,
- },
-};
-
-/*
- * If CLK_CNTL0_DUALDIV_EN == 0
- * - will use N1 divider only
- * If CLK_CNTL0_DUALDIV_EN == 1
- * - hold M1 cycles of N1 divider then changes to N2
- * - hold M2 cycles of N2 divider then changes to N1
- * Then we can get more accurate division.
- */
-static unsigned long aoclk_cec_32k_recalc_rate(struct clk_hw *hw,
- unsigned long parent_rate)
-{
- struct aoclk_cec_32k *cec_32k = to_aoclk_cec_32k(hw);
- unsigned long n1;
- u32 reg0, reg1;
-
- regmap_read(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL0, &reg0);
- regmap_read(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL1, &reg1);
-
- if (reg1 & CLK_CNTL1_BYPASS_EN)
- return parent_rate;
-
- if (reg0 & CLK_CNTL0_DUALDIV_EN) {
- unsigned long n2, m1, m2, f1, f2, p1, p2;
-
- n1 = FIELD_GET(CLK_CNTL0_N1_MASK, reg0) + 1;
- n2 = FIELD_GET(CLK_CNTL0_N2_MASK, reg0) + 1;
-
- m1 = FIELD_GET(CLK_CNTL1_M1_MASK, reg1) + 1;
- m2 = FIELD_GET(CLK_CNTL1_M2_MASK, reg1) + 1;
-
- f1 = DIV_ROUND_CLOSEST(parent_rate, n1);
- f2 = DIV_ROUND_CLOSEST(parent_rate, n2);
-
- p1 = DIV_ROUND_CLOSEST(100000000 * m1, f1 * (m1 + m2));
- p2 = DIV_ROUND_CLOSEST(100000000 * m2, f2 * (m1 + m2));
-
- return DIV_ROUND_UP(100000000, p1 + p2);
- }
-
- n1 = FIELD_GET(CLK_CNTL0_N1_MASK, reg0) + 1;
-
- return DIV_ROUND_CLOSEST(parent_rate, n1);
-}
-
-static const struct cec_32k_freq_table *find_cec_32k_freq(unsigned long rate,
- unsigned long prate)
-{
- int i;
-
- for (i = 0 ; i < ARRAY_SIZE(aoclk_cec_32k_table) ; ++i)
- if (aoclk_cec_32k_table[i].parent_rate == prate &&
- aoclk_cec_32k_table[i].target_rate == rate)
- return &aoclk_cec_32k_table[i];
-
- return NULL;
-}
-
-static long aoclk_cec_32k_round_rate(struct clk_hw *hw, unsigned long rate,
- unsigned long *prate)
-{
- const struct cec_32k_freq_table *freq = find_cec_32k_freq(rate,
- *prate);
-
- /* If invalid return first one */
- if (!freq)
- return aoclk_cec_32k_table[0].target_rate;
-
- return freq->target_rate;
-}
-
-/*
- * From the Amlogic init procedure, the IN and OUT gates needs to be handled
- * in the init procedure to avoid any glitches.
- */
-
-static int aoclk_cec_32k_set_rate(struct clk_hw *hw, unsigned long rate,
- unsigned long parent_rate)
-{
- const struct cec_32k_freq_table *freq = find_cec_32k_freq(rate,
- parent_rate);
- struct aoclk_cec_32k *cec_32k = to_aoclk_cec_32k(hw);
- u32 reg = 0;
-
- if (!freq)
- return -EINVAL;
-
- /* Disable clock */
- regmap_update_bits(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL0,
- CLK_CNTL0_IN_GATE_EN | CLK_CNTL0_OUT_GATE_EN, 0);
-
- reg = FIELD_PREP(CLK_CNTL0_N1_MASK, freq->n1 - 1);
- if (freq->dualdiv)
- reg |= CLK_CNTL0_DUALDIV_EN |
- FIELD_PREP(CLK_CNTL0_N2_MASK, freq->n2 - 1);
-
- regmap_write(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL0, reg);
-
- reg = FIELD_PREP(CLK_CNTL1_M1_MASK, freq->m1 - 1);
- if (freq->dualdiv)
- reg |= FIELD_PREP(CLK_CNTL1_M2_MASK, freq->m2 - 1);
-
- regmap_write(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL1, reg);
-
- /* Enable clock */
- regmap_update_bits(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL0,
- CLK_CNTL0_IN_GATE_EN, CLK_CNTL0_IN_GATE_EN);
-
- udelay(200);
-
- regmap_update_bits(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL0,
- CLK_CNTL0_OUT_GATE_EN, CLK_CNTL0_OUT_GATE_EN);
-
- regmap_update_bits(cec_32k->regmap, AO_CRT_CLK_CNTL1,
- CLK_CNTL1_SELECT_OSC, CLK_CNTL1_SELECT_OSC);
-
- /* Select 32k from XTAL */
- regmap_update_bits(cec_32k->regmap,
- AO_RTI_PWR_CNTL_REG0,
- PWR_CNTL_ALT_32K_SEL,
- FIELD_PREP(PWR_CNTL_ALT_32K_SEL, 4));
-
- return 0;
-}
-
-const struct clk_ops meson_aoclk_cec_32k_ops = {
- .recalc_rate = aoclk_cec_32k_recalc_rate,
- .round_rate = aoclk_cec_32k_round_rate,
- .set_rate = aoclk_cec_32k_set_rate,
-};